<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>AJAX GET请求</title>
    <style>
      #result {
        width: 200px;
        height: 100px;
        border: 2px solid black;
      }
    </style>
  </head>
  <body>
    <button>点击发送请求</button>
    <div id="result"></div>
    <script>
      const btn = document.getElementsByTagName("button")[0];
      const res = document.getElementById("result");
      res.addEventListener("mousemove", function () {
        const xhr = new XMLHttpRequest();
        xhr.open("POST", "http://127.0.0.1:8000/server");
        xhr.send();
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300) {
              console.log(xhr.readyState);
              console.log(xhr.status);
              console.log(xhr.getAllResponseHeaders());
              console.log(xhr.response);
              res.innerHTML = xhr.response;
            }
          }
        };
      });
      btn.onclick = function () {
        const xhr = new XMLHttpRequest();
        xhr.open("GET", "http://127.0.0.1:8000/server");
        xhr.send();
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300) {
              console.log(xhr.readyState);
              console.log(xhr.status);
              console.log(xhr.getAllResponseHeaders());
              console.log(xhr.response);
              res.innerHTML = xhr.response;
            }
          }
        };
      };

      window.onkeydown = function () {
        const xhr = new XMLHttpRequest();
        xhr.responseType = "json";
        xhr.open("GET", "http://127.0.0.1:8000/json-server");
        xhr.send();
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300) {
              // let data = JSON.parse(xhr.response);
              // console.log(data);
              // res.innerHTML = data.name;
              console.log(xhr.response);
            }
          }
        };
      };
    </script>
  </body>
</html>
